When a male is being ridden by a female and the male cums first. The female gets so angry that she pins the male down and shakes the semen out of her vagina onto the males chest. It is named so because it looks like a St. Bernard is slobbering all over the males chest when it happens.

Andy: So how did it go last night man?
Billy: Not so good, I came first and she gave me The Beethoven